Use newline for the end of log line

`byte{12}` at the end of log line is a typo of `byte{10}`?

https://github.com/lestrrat/go-apache-logformat/commit/26b69b0eada7d8e66d3b613d060b8948071b4899#diff-3a497b708301db4a2d3a3f665ae5ce8bL84